Quantcast

Energetic-based actuator device with rotary piston

Imported: 24 Feb '17 | Published: 06 Jan '04

Sami Daoud

USPTO - Utility Patents

Abstract

A energetic-based piston actuator system imparts a rotational motion in the piston in a manner that increases system efficiency and reliability. A malleable ring mounted about the piston neck obturates upon initiation of the energetic charge, and rifling provided on an interior surface of the actuator barrel causes the ring to rotate, and causes a counter-rotation in the piston. The rotating ring serves as a seal for preventing gas blow-by and the rotating piston is more dynamically stable throughout its travel down the barrel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, features and advantages of the invention will be apparent from the more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

FIG. 1 is a sectional side view of a piston actuator configuration in accordance with the present invention.

FIGS. 2A and 2B are cutaway side views of the piston actuator cylinder, illustrating uniform-twist and gain-twist rifling, in accordance with the present invention.

FIG. 3 is a sectional end view of a piston actuator cylinder having rifling, in accordance with the present invention.

FIGS. 4A-4C are sectional side views of the piston actuator, illustrating propagation of the piston down the cylinder body, in accordance with the present invention.

FIG. 5 is a perspective view of the piston and band, illustrating rifling-induced rotational motion of the band, and resulting counter-rotation of the piston, in accordance with the present invention.

FIG. 6 is a chart of amplitude as a function of time for the parameters of longitudinal and angular acceleration, longitudinal and angular velocity, and band pressure for a piston actuator in accordance with the present invention.

Claims

1. An energetic-based piston actuator comprising:

2. The actuator of claim 1 wherein the deformation of the malleable material of the ring further induces a corresponding counter-rotation in the piston.

3. The actuator of claim 1 wherein the piston includes a body and a neck, and wherein the piston body has an outer diameter less than the inner diameter of the interior surface of the barrel, and wherein the ring is mounted about the piston neck.

4. The actuator of claim 1 wherein the rifling comprises grooves and lands formed on the interior surface of the barrel.

5. The actuator of claim 1 wherein the rifling comprises uniform twist rifling.

6. The actuator of claim 1 wherein the rifling comprises gain rifling.

7. The actuator of claim 1 wherein the piston comprises fore and aft piston heads of an outer diameter less than the inner diameter of the barrel cylinder interior surface.

8. The actuator of claim 7 wherein the ring is positioned in a groove between the fore and aft piston heads.

9. The actuator of claim 1 further comprising an energetic, which, when detonated, drives the piston and ring in a longitudinal direction down the barrel.

10. The actuator of claim 9 wherein the energetic comprises Bis-Nitro-Cobalt-3-Perchlorate.

11. The actuator of claim 9 wherein the energetic comprises a propellant or pyrotechnic.

12. The actuator of claim 1 wherein the piston and barrel have a slip-fit relationship.

13. An energetic-based actuator comprising:

14. The actuator of claim 13 wherein the piston includes a body and a neck, and wherein the piston body has an outer diameter less than the inner diameter of the interior surface of the barrel, and wherein the ring is mounted about the piston neck.

15. The actuator of claim 13 wherein the rifling comprises grooves and lands formed on the interior surface of the barrel.

16. The actuator of claim 15 wherein the rifling comprises uniform twist rifling.

17. The actuator of claim 15 wherein the rifling comprises gain rifling.

18. The actuator of claim 13 wherein the piston comprises fore and aft piston heads of an outer diameter less than the inner diameter of the barrel cylinder interior surface.

19. The actuator of claim 18 wherein the ring is positioned in a groove between the fore and aft piston heads.

20. The actuator of claim 13 further comprising an energetic, which, when detonated, drives the piston and ring in a longitudinal direction down the barrel.

21. The actuator of claim 20 wherein the energetic comprises Bis-Nitro-Cobalt-3-Perchlorate.

22. The actuator of claim 20 wherein the energetic comprises a propellant or pyrotechnic.

23. The actuator of claim 13 wherein the ring is formed of malleable material.